One of the best performance sedans GM ever built, the Pontiac G8 GXP, is dead. The Aussies still get a Holden version, and a wagon. Heck, this one from Walkinshaw Performance packs 603HP. Wagon. V8. Supercharger. Sometimes the world's unfair. »3/24/10 10:30am 3/24/10 10:30am